Sheesh. It's literally been years since I've heard like "You were a little low on Freon, I put some in to 70-75 lbs.". I had forgotten how utterly ignorant people can be of their own profession.
Excuse the wild goose chase ablib. The things I was talking about were useful primarily in situations where you're truly stumped. Being an owner/operator myself, I had assumed he had a basic set of skills. But this guy isn't stumped. He's a hack. Please feel free to tell him as much and give him my phone number. My assumption was that he knew enough to at least get it close. Even I could skip superheat/subcooling measurement and get a charge somewhat close with a set of gauges and my hands. But this guy isn't even that smart.
I'm sure you're overcharged now. But I'm skeptical that correcting the charge will take care of it. You most likely started with a factory charge, which while not perfect it would have probably been close. Let us know what happens ablib.